Install missing transient dependencies
What does this MR do?
In !950 (diffs) we removed git-base image and moved the dependencies to the build stage of the new gitaly image. This leads to missing transient dependencies in the final image, including libcurl3-gnutls, which leads to issues such as gitlab-org/gitlab#358890 (closed).
This MR adds these dependencies.
Related issues
Closes gitlab-org/gitlab#358890 (closed)
Checklist
See Definition of done.
For anything in this list which will not be completed, please provide a reason in the MR discussion
Required
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Merge Request Title, and Description are up to date, accurate, and descriptive 
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MR targeting the appropriate branch 
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MR has a green pipeline on GitLab.com 
Expected (please provide an explanation if not completing)
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Test plan indicating conditions for success has been posted and passes 
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Documentation created/updated 
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Integration tests added to GitLab QA 
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The impact any change in container size has should be evaluated 
Edited  by Hossein Pursultani